<script setup lang="ts">
import { reactive, ref } from "vue";

import { onLoad } from "@dcloudio/uni-app";
import { getRecommand } from "@/api/home";
import { SubType } from "@/api/home";

interface metaType {
  title: string;
  coverPath: string;
  tabs: string[];
}

const metaMap = reactive<{ [key: string]: metaType }>({
  1: {
    title: "特惠推荐",
    coverPath:
      "https://pcapi-xiaotuxian-front-devtest.itheima.net/miniapp/uploads/recommend_1.jpg",
    tabs: ["价格", "折扣", "筛选"],
  },
  2: {
    title: "爆款推荐",
    coverPath:
      "https://pcapi-xiaotuxian-front-devtest.itheima.net/miniapp/uploads/recommend_2.jpg",
    tabs: ["24小时热搜", "热销总榜", "人气周榜"],
  },
  3: {
    title: "一站买全",
    coverPath:
      "https://pcapi-xiaotuxian-front-devtest.itheima.net/miniapp/uploads/recommend_3.jpg",
    tabs: ["搞定熊孩子", "家里不凌乱", "让音质更出众"],
  },
  5: {
    title: "新鲜好物",
    coverPath:
      "https://pcapi-xiaotuxian-front-devtest.itheima.net/miniapp/uploads/recommend_4.jpg",
    tabs: ["抢先尝新", "新品预告"],
  },
});

let type = $ref("1");
let meta = $ref(metaMap[type]);

onLoad(({ type }) => {
  if (type) meta = metaMap[type];
});

// 动态更新导航栏标题
uni.setNavigationBarTitle({
  title: meta.title,
});

// ---------------------------------------------------
const imgUrl = ref("");
const subTypes = ref<SubType[]>([]);
const activeIndex = ref(0);
// type 和 url 的映射关系
const urlMap = [
  { type: "1", title: "特惠推荐", url: "/hot/preference" },
  { type: "2", title: "爆款推荐", url: "/hot/inVogue" },
  { type: "3", title: "一站买全", url: "/hot/oneStop" },
  { type: "4", title: "领券中心", url: "/hot/new" }, // 后端未提供，暂用新鲜好物url
  { type: "5", title: "新鲜好物", url: "/hot/new" },
];
let currentUrlMap: { type: string; title: string; url: string } | undefined;
onLoad(async ({ type }) => {
  currentUrlMap = urlMap.find((item) => item.type === type);
  if (currentUrlMap) {
    const res = await getRecommand(currentUrlMap.url, {});
    // 修改封面图片
    imgUrl.value = res.bannerPicture;
    // 修改页面标题
    uni.setNavigationBarTitle({
      title: res.title,
    });
    subTypes.value = res.subTypes;
  }
});

// 触底加载下一页数据
const currentSubType = ref({} as SubType);
const onScrolltolower = async () => {
  // 获取当前tab所对应的数据
  currentSubType.value = subTypes.value[activeIndex.value];
  // 页数加一
  currentSubType.value.goodsItems.page++;
  // 判断当前页是否大于总页数
  if (
    currentSubType.value.goodsItems.page > currentSubType.value.goodsItems.pages
  )
    return;
  if (currentUrlMap) {
    // 请求下一页数据
    const res = await getRecommand(currentUrlMap.url, {
      page: currentSubType.value.goodsItems.page,
      pageSize: 10,
      subType: currentSubType.value.id,
    });
    // 累加数据
    currentSubType.value.goodsItems.items.push(
      ...res.subTypes[activeIndex.value].goodsItems.items
    );
  }
};
</script>

<template>
  <view class="viewport">
    <!-- 推荐封面图 -->
    <view class="cover">
      <image :src="imgUrl"></image>
    </view>
    <view class="tabs">
      <text
        class="text"
        v-for="(item, index) in subTypes"
        :key="item.id"
        :class="{ active: index === activeIndex }"
        @tap="activeIndex = index"
      >
        {{ item.title }}
      </text>
    </view>
    <scroll-view
      v-for="(item, index) in subTypes"
      :key="item.id"
      v-show="index === activeIndex"
      scroll-y
      enhanced
      :show-scrollbar="false"
      class="scroll-view"
      @scrolltolower="onScrolltolower"
    >
      <view class="goods">
        <navigator
          hover-class="none"
          url="/pages/goods/index"
          class="navigator"
          v-for="goods in item.goodsItems.items"
          :key="goods.id"
        >
          <image class="thumb" :src="goods.picture"></image>
          <view class="name ellipsis">{{ goods.name }}</view>
          <view class="price">
            <text class="symbol">¥</text>
            <text class="number">{{ goods.price }}</text>
            <text class="decimal">.00</text>
          </view>
        </navigator>
      </view>
      <view class="loading">
        {{
          currentSubType.goodsItems?.page > currentSubType.goodsItems?.pages
            ? "没有更多了"
            : "正在加载..."
        }}
      </view>
    </scroll-view>
  </view>
</template>

<style>
page {
  height: 100%;
  background-color: #f4f4f4;
}

.viewport {
  display: flex;
  flex-direction: column;
  height: 100%;
  padding: 180rpx 0 0;
  position: relative;
}

.cover {
  width: 750rpx;
  height: 225rpx;
  border-radius: 0 0 40rpx 40rpx;
  overflow: hidden;

  position: absolute;
  left: 0;
  top: 0;
}

.tabs {
  display: flex;
  justify-content: space-evenly;
  height: 100rpx;
  line-height: 90rpx;
  margin: 0 20rpx;
  font-size: 28rpx;
  border-radius: 10rpx;
  box-shadow: 0 4rpx 5rpx rgba(200, 200, 200, 0.3);
  color: #333;
  background-color: #fff;
  position: relative;
  z-index: 9;
}

.tabs .text {
  margin: 0 20rpx;
  position: relative;
}

.tabs .active::after {
  content: "";
  width: 40rpx;
  height: 4rpx;
  transform: translate(-50%);
  background-color: #27ba9b;
  position: absolute;
  left: 50%;
  bottom: 24rpx;
}

.scroll-view {
  flex: 1;
}

.goods {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  padding: 0 20rpx 20rpx;
}

.goods .navigator {
  width: 345rpx;
  padding: 20rpx;
  margin-top: 20rpx;
  border-radius: 10rpx;
  background-color: #fff;
}

.goods .thumb {
  width: 305rpx;
  height: 305rpx;
}

.goods .name {
  height: 88rpx;
  font-size: 26rpx;
}

.goods .price {
  line-height: 1;
  color: #cf4444;
  font-size: 30rpx;
}

.goods .symbol,
.goods .decimal {
  font-size: 70%;
}
</style>
